OMAHA, Neb.—ConAgra Foods Inc. voluntarily stopped production Tuesday at the Missouri plant that makes its Banquet pot pies after health officials said the pies may be linked to 139 cases of salmonella in 30 states.

ConAgra officials believe the company’s pies are safe if they’re cooked properly, but the Omaha-based company told consumers Tuesday not to eat its chicken or turkey pot pies until the government and company investigations are complete.

The U.S. Department of Agriculture also issued a health alert Tuesday afternoon to warn consumers about the link between the company’s product and the salmonella cases.

The federal Centers for Disease Control and Prevention has been tracking reports of the salmonella cases since Wednesday. A CDC spokeswoman said the largest numbers of salmonella cases had been reported in Wisconsin, Pennsylvania and Missouri.

In Minnesota, six cases of salmonella have been linked to the pot pies, the state Health Department said. None of them have been hospitalized.

Salmonella sickens about 40,000 people a year in the U.S. and kills about 600. Most of the deaths are among people with weaker immune systems such as the elderly or very young. It can cause diarrhea, fever, dehydration, abdominal pain and vomiting. Most cases of salmonella poisoning are caused by undercooked eggs and chicken.

So far no deaths have been linked to the pot pies.

Earlier this year, ConAgra had to recall all of its peanut butter because it was linked to a different salmonella outbreak.

The USDA said the Marshall, Mo., plant made Banquet and generic store brand pot pies. All of the pot pies made at the plant in question have “P-9” printed on the side of the box as part of a code above the use-by date.

ConAgra spokeswoman Stephanie Childs said she didn’t know how many people worked at the Marshall plant or what would happen to them during the shut down.

Federal officials said consumers shouldn’t throw away or eat the chicken or turkey pot pies until the Food Safety and Inspection Service can determine the source of the salmonella contamination and verify proper cooking instructions.

ConAgra is offering consumers refunds, but no recall of pot pies was being planned Tuesday.

Childs said ConAgra is confident in the safety of its chicken and turkey pot pies when all the cooking instructions on the package are followed. It is especially important to follow the directions when the pies are cooked in a microwave.

Pot pies need to be cooked longer in microwaves that have less power, Childs said. A good sign that the pot pie is done is when steam rises out of it.

Childs said the cooking will kill any common pathogens routinely found in uncooked products that contain poultry.

The company already is planning to revise the cooking directions on its pot pie packages to clarify how long the pies should be cooked in different microwaves.

Currently, the Banquet pot pie package advises consumers to cook the product for 4 minutes in a medium or high wattage microwave or for 6 minutes in a low wattage microwave. But the package doesn’t say how to determine what defines a low, medium or high wattage microwave.

Childs said ConAgra is working with federal investigators to determine whether additional precautions are necessary.

“If any indications are found that the product poses risks to consumers when cooked according to package directions, the company will take further action immediately,” ConAgra said in a statement.

Michigan State University professor Elliot Ryser said he didn’t think pot pies had been known as a problem product in the past. But the food microbiologist said consumers shouldn’t have to worry much about pot pies as long as they are completely cooked.

Cooking pot pies in a microwave can be problematic because microwaves heat food unevenly, said Ryser, who is part of the university’s National Food Safety & Toxicology Center.

“If you’re going to heat that product uniformly, it requires some diligence on the part of the consumer,” Ryser said.

In February, the CDC linked ConAgra’s peanut butter, including Peter Pan, to the illnesses of more than 625 people in 47 states.

ConAgra resumed shipping Peter Pan in August. The company faces several lawsuits filed by people who said they became ill after eating Peter Pan.

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Consumers who want a refund for their pot pie should send the side panel of the package that contains the “P-9” location code to the following address: ConAgra Foods, Dept. BQPP, P.O. Box 3768, Omaha, NE 68103-0768. Consumers with questions can call the company toll free at (866) 484-8671.

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